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(共26张PPT)
Lesson 4: Thank you, Mr Pasteur!
Unit 5
Great inventions
Learning aims
能够读懂对话，理解“pasteurized”的含义与目的，回答关于概念解释、原因、人物贡献等问题；
能够掌握本课时单词、短语和句型；
能够用英语谈论自己喜欢的发明，并书写介绍某一项发明。
New Word
pour /p (r)/ v. 倒；下大雨
pasteurize/'pɑ st ra z/ v. 用巴氏杀菌法消毒
process/'pr ses/ n. 过程；流程
v. 处理；加工
heat/hi t/ v. 加热；（使）变暖
n. 热；温度
raw /r :/ adj. 未经加工的；生的
bacteria /b k't ri / n. 细菌
germ /d m/ n. 病菌；细菌；微生物
microbiologist / ma kr ba ' l d st/ n. 微生物学家
dairy /'de ri/ n. 牛奶场；乳品店；乳制品
adj. 牛奶的；乳品业的
scientist /'sa nt st/ n. 科学家
toast /t st/ n. 干杯；敬酒；烤面包片
v. 为……干杯；烤
Lead-in
Read the questions and give your answers.
A Do you drink milk every day Why
B Do you know how the milk we drink is processed
Yes, I do. Because it’s good for my health.
Yes, I do./No, I don’t.
1
Activity 1
Pre-reading
2
What’s the main idea of the conversation
The main idea of the conversation
is that Jeremy learns about pasteurized milk from his mum.
Activity 2
While-reading
While pouring a glass of milk, Jeremy notices something written on the package.
Jeremy: Hey, Mum! I just noticed a big word on the carton. PASTEURIZED. What does it mean
Mum: Well, if something is pasteurized, it means that it has gone through a process of heating to a certain temperature.
Jeremy: Why do we heat milk
Mum: Raw milk has dangerous bacteria and germs. We must heat milk to 72 degrees Celsius for 15 seconds to kill them.
Jeremy: How did people discover that
Mum: Many years ago, people sometimes got sick when they drank milk. Some of them even died because of the bad bacteria.
Jeremy: Wow! Who created this heating process A dairy farmer or a scientist
Mum: It was Louis Pasteur, a French microbiologist. He invented the process around 1864.
Jeremy: That's a long time ago!
Mum: (She nods and adds.) Mr Pasteur was one of the greatest scientists. His work saved millions of lives around the world. He was famous for his work on germs.
Jeremy: (He raises his glass of milk in the air.) Well, here's a toast to you, Mr Pasteur. Thank you for making the world much safer.
Read the passage and answer the questions.
A According to the passage, what does the word “PASTEURIZED” mean
B How did people know their milk needed to be heated
C How did Louis Pasteur's work make the world safer
If something is pasteurized, it means that it has gone through a process of heating to a certain temperature.
Many years ago, people sometimes got sick when they drank milk. Some of them even died because of the bad bacteria.
By heating milk to 72 degrees Celsius for 15 seconds to kill bacteria and germs.
3
Match the words with their meanings:
Pasteurize Microbes that can cause disease
Bacteria Tiny harmful organisms
Germs Heat to kill bacteria
Read the dialogue and match the correct meanings.
4
Pasteurization was discovered in 1864. （ ）
Raw milk is safer than pasteurized milk. （ ）
T
F
Read the dialogue and write true(T) or false(F).
5
Read the passage again and complete the paragraph with the correct forms of the words.
invent get solve heat kill
Pasteurization is a process that keeps milk safe from harmful bacteria by heating it. In the past, people sometimes ___________ sick or even died after drinking milk. To ___________ this problem, Pasteur __________ the process of pasteurization around 1864. He ____________ the milk to 72 degrees Celsius and kept it at that temperature for 15 seconds. Harmful bacteria and germs in the milk _____________, and the milk became safer to drink.
got
solve
invented
heated
were killed
6
Work in pairs. Discuss the following questions and take notes.
What's your favourite invention
Who invented it
How did it change our
lives
I think it’s paper.
Cai Lun invented paper in ancient China.
Paper made writing and recording information much easier and cheaper. And it helped spread knowledge.
Pair work
7
Writing
Write a passage to introduce an invention.
Useful expressions
It was invented by...
It was invented in...
It has made a great difference in my life/our lives.
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Activity 3
Post-reading
8
Paper is one of the most important inventions in human history. It was invented by Cai Lun in the Eastern Han Dynasty.
Before paper was made, people recorded information on bamboo slips or silk, which were either heavy or expensive. Cai Lun improved the paper-making process,using materials like bark and rags. (树皮和破布)
Paper has made a great difference in our lives. It speeded up the spread of knowledge through books, newspapers and magazines.
明确写作任务
1、文章分为三段式（表达主题，对世界影响，对我的影响）。
2、整理写作要点，按照逻辑顺序连词成句。
3、使用恰当有用的词汇，短语，句式。
写作总结
Pay attention to
Spelling
Grammar
Choices
of words
Logic of sentences
Language point 1
用法：
及物动词，后接 “倾倒物” + into +“容器 / 接收对象” 。其结构为 pour + 宾语（物） + into + 宾语 。
例句：
Please pour the juice into the bottle. 请把果汁倒进瓶子里。
1. While pouring a glass of milk, Jeremy notices something written on the package.
pour 意为“倒”
Point
Language point 2
用法：
主语通常是人，结构为 主语 + get sick ，可接 “because of...”（因…… 生病）补充原因 。
例句：
If you eat bad food, you may get sick easily.
如果你吃了不好的食物，你很容易生病。
2. ...people sometimes got sick when they drank milk.
get sick 意为“生病 ”
Point
Language point 3
3 ...it means that it has gone through a process of heating to a certain temperature.
go through 经历（过程、困难等）
Point
用法：
及物短语，后接 “过程、流程、困难” 等名词，结构为 go through + 宾语（过程 / 事物） 。
例句：
He went through a hard time last year.
他去年经历了一段艰难的时光。
Language point 4
4. ...it means that it has gone through a process of heating to a certain temperature.
某一特定温度
Point
用法：
作宾语或主语，常搭配 “reach（达到）、heat to（加热到）” 等动词，结构为：动词 + a certain temperature。
例句：
Water boils at a certain temperature, 100℃ at sea level.
水在一定温度下沸腾，海平面为 100℃。
Language point 5
5. He raises his glass of milk in the air.
把…… 举到空中
Point
用法：
及物短语，结构为 raise + 宾语（物品 / 身体部位等） + in the air，常出现在 “庆祝、展示” 等语境 。
例句：
She raises her hand in the air to answer the question.
她举起手回答问题。
Exercise
I. 用所给词的适当形式填空
1. Journey to the West ______ （write） by Wu Cheng’en in Ming Dynasty is very popular with teenagers.
2. Eating too much junk food is ________ (harm) to your health.
3.It's too (danger) for the young children to play near the river by themselves.
4. Qinhuangdao is such a beautiful city that __________ (million) of tourists come here every Summer .
5. The heavy rain may keep us from _______ (go) out tomorrow.
written
harmful
dangerous
millions
going
Ⅱ. 完成句子
为了健康，我们应该选择经过巴氏杀菌的牛奶。
For health, we should choose __________ ________.
很多年前，人们喝生牛奶时有时会生病。
Many years ago, people sometimes ____ ____ when they drank raw milk.
杰里米把他的牛奶杯举到空中致敬巴斯德。
Jeremy _____ ___ ____ ____ ____ ___ ____ ______ to toast Mr Pasteur.
巴氏杀菌法让牛奶变得更安全了。
Pasteurization ______ _____ ______.
pasteurized milk
got sick
raises his glass of milk in the air
makes milk safer
Homework
Search on the internet to collect more information about Louis Pasteur.

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